Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f35df203fd9888e…

MALICIOUS

PDF

87.0 KB Created: 2021-06-29 07:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e4c95a0abe92c41382873874416a418 SHA-1: 3b86f388346120976c2f25ff104851b88e693d18 SHA-256: 8f35df203fd9888e03b6ae2925d12248beda8906198aaae8320deaf194b829d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.toptehnik.si/images/wegolepigitevomanevib.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac50e5665e2---79181257866.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/288b77d9cc2edb65ec442fe8b385525e/zutekeridozimovipojovep.pdf
    • http://retroldn.com/userfiles/file/jofaredonegipagupame.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c969421d9e0---18752221591.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b360852f3a---11629394873.pdf
    • https://big-affaires.com/img/pics/files/64911580974.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a44cce1bacca778e7d2b44af00b42bf8/27862170510.pdf
    • http://jhdjt.com/images/upload/File/12918711886.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/sezuvitu.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b798b53ad77---3940197903.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/o1oh37kfgq3hree63u7doao88r/39245146292.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/9ef2bd85a8254f3cf07b2069ee941a19/24467302357.pdf
    • http://wksx.top/images/userfiles/file/zidozaxojinerevoparuduku.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/86019c787f8907ac7de7ddc2c9cf5d9e/zegirusej.pdf
    • http://eprdel.cz/userfiles/file/13386991647.pdf
    • http://ac-kenigsberg.ru/files/file/40122846318.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30d686a093---jexepeziwodu.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fc189cbcd---papirolematutafokibosoril.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba51c64a61---gixewemigufapomokifawi.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ecfc0bea3ec4cf1bf210aa94a88592c2/30050475445.pdf
    • http://adance0112.com/upfile/editor/file/98388380891.pdf
    • http://botosani.ro/img/uploads/file/gexowulepo.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/dijofezun.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea4469fd98---wejewulimi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=vehicle+rental+agreement+form
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f278.bin
a96b188bd57538c5b8343da88eb6b1ec430ca20964b1a9d2e8e9fd70e20e1541
pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 16948 bytes
font_01_sfnt_off00011eab.bin
136132692e0f13aa9b5c36e36c8da0556a101146abeebf38c7d3af9107087a92
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 10584 bytes
font_02_sfnt_off000136ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136AD 16792 bytes